Re: [PATCH -v2 0/9] mm: make movable onlining suck less

[Michal Hocko]

On Mon 10-04-17 17:22:28, Michal Hocko wrote:
[...]
> Heh, this one is embarrassing
> diff --git a/drivers/base/memory.c b/drivers/base/memory.c
> index 1c6fdacbccd3..9677b6b711b0 100644
> --- a/drivers/base/memory.c
> +++ b/drivers/base/memory.c
> @@ -402,7 +402,7 @@ static ssize_t show_valid_zones(struct device *dev,
>  		return sprintf(buf, "none\n");
>  
>  	start_pfn = valid_start_pfn;
> -	nr_pages = valid_end_pfn - valid_end_pfn;
> +	nr_pages = valid_end_pfn - start_pfn;
>  
>  	/*
>  	 * Check the existing zone. Make sure that we do that only on the

Btw. while starting into the code I think that allow_online_pfn_range is
also wrong and we need the following
diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index 94e96ca790f6..035165ceefef 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -858,7 +858,7 @@ bool allow_online_pfn_range(int nid, unsigned long pfn, unsigned long nr_pages,
 	 * TODO make sure we do not overlap with ZONE_DEVICE
 	 */
 	if (online_type == MMOP_ONLINE_KERNEL) {
-		if (!populated_zone(movable_zone))
+		if (!movable_zone->spanned_pages)
 			return true;
 		return movable_zone->zone_start_pfn >= pfn + nr_pages;
 	} else if (online_type == MMOP_ONLINE_MOVABLE) {

because we would allow ZONE_NORMAL after the full movable zone has been
offlined.
-- 
Michal Hocko
SUSE Labs